Rotary distributor phasing circuit



Aug.` 23, 1932. G. A. LOCKE ROTARY DISTRIBUTOR PHASING CIRCUIT Filed Jan. 22. 1931 .uw mTlWEEEDEEUEDEDDEEDDDD DDDEEEIDI V, E ww Dn. .1. om MW WM/@ Er! V WA? @a w Patented Aug. 23, 1932 f Unire STTES iiaiiq.

PATENT @FFICE GEORGE A; LOCKE, F GLENWOOD, YORK, ASSIGNOR T10 BELL TELEPHONE LABORA- TORES, NCORPORATED, OF NEW YORK., N. -Y., A CORPORATION OF YORK ROTARY Dis'rniiau'roia rnasiive CIRCUIT l Application vled. January22, 193:1; Serial 110.510,36.

so that `signals are received over the channel corresponding to the one transmitting, these 15 lamps are arranged to be connected during adjusting intervals tothe receiving distributor in place of the receiving printers. The connections are established vby meansof 'a switch on the receiving distributor whereby o A: the lamps are connected to the incoming lineV or cable when preparingthe system for transmission after a period of non-use. Five impulses are transmitted for each channel Aover the line orcable, the polarity of these pulses l reversing at the end of each` channel. The

lamps are also connected in multiple toa positive or negative battery, .asv desired, and as the rotatable brush passes over the segments of the receiving distributor the lamps j connected to alternate groups of five segments will light, indicating that the'brush is in synchronous phase with the incoming spacing impulses. Should the lamps in adjacent groups light, which indicates a departure from synchronous phase,jthe receiving distributor rings are oriented in either a forward or backward direction with respect to the direction of rotation of the brush, until the proper groups of lamps are lighted or the f4() brush may be adjusted Aas Ahereinafter described. However, itlhas been noticed when 1 adjusting the system for proper phase relation Vthat the `lighting of ,theuproper groups l Voflaiiips during the phasing operationidoes 45 not alwaysprove that the receiving brush is impulses because, although the brush maybe in `engagement with` the proper segment at the time an impulse is received, the brush may not be in position to receive the'middle por-- tion of the impulse and therefore the phase relation is only approximately correct.

' According to this invention, the phase relation may be made more nearly correct by using a margin 'adjusting'circuit connected to a segment at the end of a channel. The segmented receiving ringon the receiving dislin correct :phase with the incoming'spacing tributor is ,divided into alternate klive and dead segments, there being iive livesegments and tive dead segments in each group. When perfect phase relation ishad the incoming impulses are impressed on the live segments and by means of the phasing lamps this phase .relation may be partially o tainedif a pulse is impressed on any part'of Aa live segment, p -the remaining part being impressed on the adjacent deadA segment. By connecting afinaradjusting circuit to the dead segment at apoint where a change polarity occurs `and true phase relation does not exist, a part of the incoming impulse will be received inthe circuit. By providing an indicating meterin circuit the direction ofthe pulse current 'is indicated by a movable pointer 'or indicator whereby it can be determined in4 what direction the receiving rings Vmust be further oriented in order to bring theV live segment into position to 'receive the middle portion .of theincoming impulse. The singleligure of the drawing-'illustrates a preferred embodiment of the invention.

`:Referring to the figure, line 1l is shown -.terminating at station X in differentialline relay l2 which is responsive t0 the incoming signals only. The incoming signal impulses ,reproduced by relay l2 `are impressed on `receiving rings 13 to operate a series of printers,

ora set of storing relays if it is desiied torepeatthe signals to another station. Forthe ,Y purpose of 'illustration7 it is assumed]here.v`

justs the drive'motor at Vhis-station as soon as the incoming impulses begin to arrivel as indicated by the operation of meter 14. The

attendant will then operate switch 15, to connect in place of the printers,.a seriesv oi lamps to the receiving segments-of ring 16.' Ring 16 is -divided into forty alternate. live and dead segments-.to provide for, tour channels A, B,C and I),y there being tive live and five Y deadsegments foreach channel. Each lamp is connected at oneside to a live segment and at the other side to a common grounded positive battery17. rIheselamps are numbered in accordancewith' the live segments of ring 16 to which they are connected. At each revolution of the distributors atthe station (not shown) there are transmitted over line 11 twenty spacing impulses, namely, five positive impulses, five negative impulses, five vpositive impulses andfive negative impulses and received in the two windings in series of relay 12, meter 14, artificial line 19 andreturned through earth. `Relay 12 will close its left Contact during the reception of each Y group of positive impulses and its right coni no' Ytact during the reception of each group of negative impulses; Positive battery will Vtherefore be connected overthe armature of relay V12 through thephasing lamps to positive battery .17 during the reception Vof impulses Nos. 1 to 5 and 11 to 15, while negative battery will be connected during the reception of impulses- Nos. 6 to 10 and 16 to 20. Rotatable brush 2O on ring set 13 is differentially coupled tothe distributor drive shaft so asto becapable of vmanual adjustment relative thereto without interferingwith the driving. Inasmuch as'thc lamps are connected to positive battery, only. those lamps to which` negative impulses are directed will be lighted. `Brush 2O will then be adjusted untillamps 6 to 10 and 16 to 20, that is, those connected to channelsB and D are lighted. The Vimpulses are then received at station X in the same order and relation .as those that are sent from the distant station.

' After this adjustment is completed a per- Arect Vphase relation between the rotatable brush and thereproduced impulses may be fstilllacking. because the middle portions of the reproducedimpulses may not beV centered on the l1ve segments. This condition will be indicated by the pointer on meter 21 which will swing a greater distance to one side of its zerol position than to the other, as the brush 20 passes over the last dead segment of channel B to which the margin adjusting circuit, shown herein, is connected. The

Q which the present invention is applicable reference may be made to the Curtis U. S. Patent 1,689,328, granted October 30,1928.

Y What is claimed'is: j n

1. In an impulse reception system, an incoming circuit, a device connected thereto adapted tobe synchronized with impulsesreceived from impulse .transmitting mecha'- nism at a remote' Vterminal of the circuit, means for establishing approximate synchronism of said device, characterized in this, that an indicating circuit is connected to said device at a point whereat the character of the received impulses reverses, to indicate any slight error inthe true synchronous phase relation between said device and the received impulses. Y

2,.,Inta signaling System, a line, devices connected to opposite ends of'said line and .arranged to transmit and receive, 'respectively, impulses of opposite polarities, each of said devices comprising a contacting element, y means for establishing approximate synchronism between said devices, a circuit connected to the receiving device at a single point where the polarity of adjacent received impulses reverses, and an element in saidcir-` Ycuit for indicating any slight error in the4V adjustment of synchronous phase relation ben tween the` contacting element of the receiving device and the received impulses.

3. In a signaling system, a multi-channel transmission circuit, multiplex rotary distributors connected to the opposite ends of said circuit and arranged to transmit and receive, respectively, impulses reversing in polarity at the end of each channel, each of said distributors comprising a rotatable brush andr a ring of alternate live and dead segments on said receiving distributor, means for establishing approximate synchronism between said devices, a circuit connected to a dead segment at the end of onechannel only, and an lelement in said circuit forv indicating the amount of adjusting to be madein order to 'brush 20 may then be further adjusted until bring the rotatable brush ofthe receiving ldistributor into true synchronous phase relation with'the received impulses.

and a plurality of lamps which may be arbi-l trarily connected in place of said receiving devices to the respective live segments of the receiving distributor whereby approximate synchronous phase is indicated.

In witness whereof, I hereunto subscribe my name this 16th day of January, 1931.

GEORGE A. LOCKE. 

